The SIG MCX Virtus is a modular short-stroke gas piston AR-style rifle. The Virtus platform allows barrel swaps between 5.56, .300 Blackout, and other calibers. Free-float M-LOK handguard, folding stock, and ambidextrous controls. Type: Semi-Auto Rifle Action: SA Caliber: 5.56 NATO Capacity: 30 Year introduced: 2018, USA Weight: 87.5 oz Overall length: 35" Status: Active Intended use: Tactical, Competition, Home Defense